Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2a51db358de37b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 13:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8626ab4b5a0f5199eaa7f64454098c9a SHA-1: bbd5e89638caa019beeb38dc6cb8f312f76b2be0 SHA-256: ee2a51db358de37b0d368df36d2599954cb333e875d17b7b58a00ae8cec4b9d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous compromised WordPress upload storage locations and disposable hosting, indicating an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the nature of the link farm suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://szabobuszrendeles.hu/files/files/wasok.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d89b557c10a---98361793779.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/wugatajuduzazume.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f46d24b98---77862169933.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161009288988f1---30114252226.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rvp1edbqaf9vs9vv9chtl8m355/tukasizoko.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/29135020117.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///92280155952.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/64602545488.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3508cd1d1c---jefavotujegaburisore.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/bd6bcb34693d6d0b23ccacfcea193954/femeponama.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/70003615221.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/3005024874.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d93da825d---92826274002.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tkdpq5ieg60vkf22g1gu468gsd/21185119873.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/64706905928.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce901a2e5---44644768630.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ec9db42f5cb9681c6927c608a0b3acf8/nemupefovaremesumati.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/denukedebamajujunapu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/67069511202.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9afbf3edad---29817308973.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/85465135883.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ce32d2f20.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+human+animal+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 10692 bytes
SHA-256: a095f0915733472ae353821e24a35bd3441276b3d5b4800c8693e24debc716e1
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 17668 bytes
SHA-256: 13c49339dc135c2e215f3b9a5c792f2711957a38ebb73bd901c440451f0bd9a4
font_02_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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